... ,8L,10L,15L 2.material : plastic 3.hight thermal insulation 4.inner bladder : PE capacity :5L,8L,10L,15Lmaterial : plastic hight thermal insulation ... 5L,8L,10L and 15L. The beer keg is all plastic , inside is made of PE material , outside is made of ... PP material .The thermal insulation layer is made of PUD material which can keep the tempreture of fresh beer . Plastic Beer keg